Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2005-11-14
2010-02-16
Appiah, Charles N (Department: 2617)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S434000, C455S574000, C455S343300, C455S343400, C455S343200
Reexamination Certificate
active
07664497
ABSTRACT:
A method of timer-based registration prevents timer-based registrations that are not needed from being sent. A history is maintained of time instances of implicit registrations transmitted by a mobile station over a communications network. If an elapsed time between a pair of successive ones of the time instances in the history is not less than a registration period with the network, a timer-based registration of the mobile station with the communications network is initiated after the expiry of a random time value less than the registration period. Otherwise, a timer-based registration is initiated after the expiry of a time period equal to the registration period.
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Islam Khaledul M.
Willey William Daniel
Xue Hao
Ajibade Akonai Olumide T
Appiah Charles N
Heenan Blaikie LLP
Research In Motion Limited
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